In 1991, a white humpback whale was spotted off the east coast of Australia and given the name Migaloo. You can see him in action in the video below. Every year since there's been a concerted effort to spot the albino whale during this migration. Interest became so intense at one point that regulations were enacted to create an exclusion zone around the whale.
Sadly, recent photos seem to indicate that Migaloo is suffering from skin disease as a result of its lack of sun-blocking pigmentation.